Gamma-Ray Constraints on Heavy Axion-Like-Particle Decays from Fermi-LAT and H.E.S.S. Blazar Spectra

A. Acharyya, F. Aharonian, M. Backes +117

The propagation of very-high-energy (VHE; $E_{\gamma }\ge 100$ GeV) gamma rays from extragalactic sources is affected by interactions with photons of the extragalactic background light (…